So there are many players that don't endear themselves to many fans. There are many players who you love when they're on your team but despise when they move to a new team (Manny Ramirez comes to mind)
Some of the greatest players clearly had people who couldn't stand them...ARod, Reggie Jackson, Pete Rose, Ricky Henderson to name a few.
Are there any players who are universally loved?
I think I'll vote for Ken Griffey Jr.
We could probably have the same conversation for Managers. In that case, I'll vote for Tommy Lasorda.